Table 1.

Characteristics of the Cohort

	All		Black Women		Black Men		White Women		White Men		Race – Sex Differences
Variable*	Mean or N	SD or %	Mean or N	SD or %	Mean or N	SD or %	Mean or N	SD or %	Mean or N	SD or %
Age	40.0	3.7	39.6	3.9	39.5	3.6	40.7	3.3	40.2	3.6	p < 0.0001 Blacks younger than whites
Ethnicity
Black	421	55.6
White	336	44.4
Gender
Female	436	57.6
Male	321	42.4
Education											p < 0.0001 Whites higher than blacks, BW > WM
<= High school	164	21.7	69	27.0	51	30.9	21	11.7	23	14.7
> High school	593	78.3	187	73.0	114	69.1	159	88.3	133	85.3
BMI (kg/m2)	29.3	7.3	32.0	8.2	29.7	6.4	26.6	7.3	27.7	4.7	p < 0.0001 BW > BM > WM > WW (all pairwise sig)
SBP (mmHg)	114.1	14.1	117.6	15.2	117.4	12.5	107.5	13.6	112.4	11.3	p < 0.0001 BM > BW > WM > WW (all pairwise sig)
DBP (mmHg)	75.5	10.6	76.8	11.3	78.0	10.9	71.6	9.4	75.4	8.9	p < 0.0001 BM > BW,WM >
Heart Rate (bpm)	72.6	11.6	74.8	10.7	71.8	11.8	72.2	11.7	70.3	12.0
Diabetes mellitus	45	5.9	19	7.4	9	5.5	11	6.1	6	3.9	p < 0.0001 B > W, M > W
Hypertension	133	17.6	63	24.6	33	20.0	21	11.7	16	10.3	p < 0.0001 B > W
Smoking status											p < 0.0001 B > W, WW highest ex-smoker
never	486	64.3	152	59.6	102	61.8	112	62.2	120	76.9
ex-smoker	128	16.9	41	16.1	20	12.1	49	27.2	18	11.5
current	142	18.8	62	24.3	43	26.1	19	10.6	18	11.5
HF Power(msec2)	771.74	1272.90	974.14	1748.03	726.81	1140.36	649.04	855.07	628.71	740.06
LF Power(msec2)	826.70	1106.71	605.71	832.4	903.29	1137.19	695.38	998.17	1259.86	1421.02
LF/HF Ratio	2.205	3.139	1.276	1.635	2.645	4.380	2.063	2.516	3.427	3.590
SD (msec)	46.33	21.79	43.74	23.27	46.77	22.75	44.22	18.18	52.56	21.00

Note: B = black and W = white in racial comparisons; M = men and W = Women in comparison of sex differences